The decibel scale is logarithmic. 120 dB is one joule of sound energy. 130 Joules is ten times more: 10 Joules, 140 is 100 Joules etc. (Source)
The loudest sound on Earth is said to be Krakatoa at 180 dB. This is a megaJoule of sound energy. (source) But Krakatoa released 840 PetaJoules in total (source) or 840 billion MegaJoules. So 1/840000000000 of the energy was converted to sound.
If we suppose that the same fraction of a supernova's energy is converted to sound, and a supernova releases 1044 joules, That means that about 1044/(840 billion) = 1032 Joules of sound energy, thirty-two orders of magnitude greater than 120 dB, or about 440 decibels. This means that the sound energy would be enough to vaporise the Earth.